Compare Elements
Compare two chemical elements side by side across 19 atomic and physical properties.
| Property | Pm Promethium | Sm Samarium |
|---|---|---|
| Atomic Number | 61 lower | 62 lower |
| Symbol | Pm different | Sm different |
| Name | Promethium different | Samarium different |
| Atomic Mass | 144.9128 lower | 150.4 lower |
| Category | Lanthanides same value | Lanthanides same value |
| Period | 6 same value | 6 same value |
| Group | 3 same value | 3 same value |
| Block | f-Block same value | f-Block same value |
| Standard State | Solid same value | Solid same value |
| Electronegativity | — no data | 1.17 no data |
| Atomic Radius | 236 higher | 229 higher |
| Ionization Energy | 5.55 lower | 5.644 lower |
| Electron Affinity | — no data | — no data |
| Oxidation States | +3 different | +3, +2 different |
| Melting Point | 1315 K (1041.85 °C) lower | 1347 K (1073.85 °C) lower |
| Boiling Point | 3273 K (2999.85 °C) higher | 2067 K (1793.85 °C) higher |
| Density | 7.26 lower | 7.52 lower |
| Electron Configuration | [Xe]6s2 4f5 different | [Xe]6s2 4f6 different |
| Year Discovered | 1945 different | 1879 different |
higher lower
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